/*
 * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
 *
 * This file is part of the KD Chart library.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "KChartPolarCoordinatePlane.h"
#include "KChartPolarCoordinatePlane_p.h"

#include "KChartPainterSaver_p.h"
#include "KChartChart.h"
#include "KChartPaintContext.h"
#include "KChartAbstractDiagram.h"
#include "KChartAbstractPolarDiagram.h"
#include "KChartPolarDiagram.h"
#include "KChartMath_p.h"

#include <QFont>
#include <QList>
#include <QtDebug>
#include <QPainter>
#include <QTimer>


using namespace KChart;

#define d d_func()

PolarCoordinatePlane::PolarCoordinatePlane ( Chart* parent )
    : AbstractCoordinatePlane ( new Private(), parent )
{
    // this bloc left empty intentionally
}

PolarCoordinatePlane::~PolarCoordinatePlane()
{
    // this bloc left empty intentionally
}

void PolarCoordinatePlane::init()
{
    // this bloc left empty intentionally
}

void PolarCoordinatePlane::addDiagram ( AbstractDiagram* diagram )
{
    Q_ASSERT_X ( dynamic_cast<AbstractPolarDiagram*> ( diagram ),
                 "PolarCoordinatePlane::addDiagram", "Only polar"
                 "diagrams can be added to a polar coordinate plane!" );
    AbstractCoordinatePlane::addDiagram ( diagram );
    connect ( diagram,  SIGNAL (layoutChanged(AbstractDiagram*)),
              SLOT (slotLayoutChanged(AbstractDiagram*)) );

}

void PolarCoordinatePlane::paint ( QPainter* painter )
{
    AbstractDiagramList diags = diagrams();
    if ( d->coordinateTransformations.size() != diags.size() ) {
        // diagrams have not been set up yet
        return;
    }
     // need at least one so d->currentTransformation can be a valid pointer
    Q_ASSERT( !d->coordinateTransformations.isEmpty() );

    PaintContext ctx;
    ctx.setPainter ( painter );
    ctx.setCoordinatePlane ( this );
    ctx.setRectangle ( geometry() /*d->contentRect*/ );

    // 1. ask (only!) PolarDiagrams if they need additional space for data labels / data comments

    const qreal oldZoomX = zoomFactorX();
    const qreal oldZoomY = zoomFactorY();
    d->newZoomX = oldZoomX;
    d->newZoomY = oldZoomY;
    for ( int i = 0; i < diags.size(); i++ ) {
        d->currentTransformation = & ( d->coordinateTransformations[i] );
        qreal zoomX;
        qreal zoomY;
        PolarDiagram* polarDia = dynamic_cast<PolarDiagram*> ( diags[i] );
        if ( polarDia ) {
            polarDia->paint( &ctx, true, zoomX, zoomY );
            d->newZoomX = qMin( d->newZoomX, zoomX );
            d->newZoomY = qMin( d->newZoomY, zoomY );
        }
    }

    if ( d->newZoomX != oldZoomX || d->newZoomY != oldZoomY ) {
        //qDebug() << "new zoom:" << d->newZoomY << " old zoom:" << oldZoomY;
        d->currentTransformation = nullptr; // not painting anymore until we get called again
        QMetaObject::invokeMethod( this, "adjustZoomAndRepaint", Qt::QueuedConnection );
        return;
    }

    // 2. there was room enough for the labels, so start drawing

    // paint the coordinate system rulers:
    d->currentTransformation = &d->coordinateTransformations.first();
    d->grid->drawGrid( &ctx );

    // paint the diagrams which will re-use their DataValueTextInfoList(s) filled in step 1:
    for ( int i = 0; i < diags.size(); i++ ) {
        d->currentTransformation = & ( d->coordinateTransformations[i] );
        PainterSaver painterSaver( painter );
        PolarDiagram* polarDia = dynamic_cast<PolarDiagram*>( diags[i] );
        if ( polarDia ) {
            qreal dummy1, dummy2;
            polarDia->paint( &ctx, false, dummy1, dummy2 );
        } else {
            diags[i]->paint( &ctx );
        }
    }
    d->currentTransformation = nullptr;
}


void PolarCoordinatePlane::adjustZoomAndRepaint()
{
    const qreal newZoom = qMin(d->newZoomX, d->newZoomY);
    setZoomFactors(newZoom, newZoom);
    update();
}


void PolarCoordinatePlane::resizeEvent ( QResizeEvent* )
{
    d->initialResizeEventReceived = true;
    layoutDiagrams();
}

void PolarCoordinatePlane::layoutDiagrams()
{
    // the rectangle the diagrams cover in the *plane*:
    // (Why -3? We save 1px on each side for the antialiased drawing, and
    // respect the way QPainter calculates the width of a painted rect (the
    // size is the rectangle size plus the pen width). This way, most clipping
    // for regular pens should be avoided. When pens with a penWidth or larger
    // than 1 are used, this may not b sufficient.
    const QRect rect( areaGeometry() );
    d->contentRect = QRectF ( 1, 1, rect.width() - 3, rect.height() - 3 );

    const ZoomParameters zoom = d->coordinateTransformations.isEmpty() ? ZoomParameters()
                                                                       : d->coordinateTransformations.front().zoom;
    // FIXME distribute space according to options:
    const qreal oldStartPosition = startPosition();
    d->coordinateTransformations.clear();
    Q_FOREACH( AbstractDiagram* diagram, diagrams() )
        {
            AbstractPolarDiagram *polarDiagram = dynamic_cast<AbstractPolarDiagram*>( diagram );
            Q_ASSERT( polarDiagram );
            QPair<QPointF, QPointF> dataBoundariesPair = polarDiagram->dataBoundaries();

            const qreal angleUnit = 360 / polarDiagram->valueTotals();
//qDebug() << "--------------------------------------------------------";
            const qreal radius = qAbs( dataBoundariesPair.first.y() ) + dataBoundariesPair.second.y();
//qDebug() << radius <<"="<<dataBoundariesPair.second.y();
            const qreal diagramWidth = radius * 2; // == height
            const qreal planeWidth = d->contentRect.width();
            const qreal planeHeight = d->contentRect.height();
            const qreal radiusUnit = qMin( planeWidth, planeHeight ) / diagramWidth;
//qDebug() << radiusUnit <<"=" << "qMin( "<<planeWidth<<","<< planeHeight <<") / "<<diagramWidth;
            QPointF coordinateOrigin = QPointF ( planeWidth / 2, planeHeight / 2 );
            coordinateOrigin += d->contentRect.topLeft();

            CoordinateTransformation diagramTransposition;
            diagramTransposition.originTranslation = coordinateOrigin;
            diagramTransposition.radiusUnit = radiusUnit;
            diagramTransposition.angleUnit = angleUnit;
            diagramTransposition.startPosition = oldStartPosition;
            diagramTransposition.zoom = zoom;
            diagramTransposition.minValue = dataBoundariesPair.first.y() < 0 ? dataBoundariesPair.first.y() : 0.0;
            d->coordinateTransformations.append( diagramTransposition );
        }
    update();
}

const QPointF PolarCoordinatePlane::translate( const QPointF& diagramPoint ) const
{
    Q_ASSERT_X ( d->currentTransformation != nullptr, "PolarCoordinatePlane::translate",
                 "Only call translate() from within paint()." );
    return  d->currentTransformation->translate ( diagramPoint );
}

const QPointF PolarCoordinatePlane::translatePolar( const QPointF& diagramPoint ) const
{
    Q_ASSERT_X ( d->currentTransformation != nullptr, "PolarCoordinatePlane::translate",
                 "Only call translate() from within paint()." );
    return  d->currentTransformation->translatePolar ( diagramPoint );
}

qreal PolarCoordinatePlane::angleUnit() const
{
    Q_ASSERT_X ( d->currentTransformation != nullptr, "PolarCoordinatePlane::angleUnit",
                 "Only call angleUnit() from within paint()." );
    return  d->currentTransformation->angleUnit;
}

qreal PolarCoordinatePlane::radiusUnit() const
{
    Q_ASSERT_X ( d->currentTransformation != nullptr, "PolarCoordinatePlane::radiusUnit",
                 "Only call radiusUnit() from within paint()." );
    return  d->currentTransformation->radiusUnit;
}

void PolarCoordinatePlane::slotLayoutChanged ( AbstractDiagram* )
{
    if ( d->initialResizeEventReceived ) layoutDiagrams();
}

void PolarCoordinatePlane::setStartPosition( qreal degrees )
{
    Q_ASSERT_X ( diagram(), "PolarCoordinatePlane::setStartPosition",
                 "setStartPosition() needs a diagram to be associated to the plane." );
    for ( CoordinateTransformationList::iterator it = d->coordinateTransformations.begin();
                                                it != d->coordinateTransformations.end();
                                                ++it )
    {
        CoordinateTransformation& trans = *it;
        trans.startPosition = degrees;
    }
}

qreal PolarCoordinatePlane::startPosition() const
{
    return d->coordinateTransformations.isEmpty()
        ? 0.0
        :  d->coordinateTransformations.first().startPosition;
}

qreal PolarCoordinatePlane::zoomFactorX() const
{
    return d->coordinateTransformations.isEmpty()
        ? 1.0
        : d->coordinateTransformations.first().zoom.xFactor;
}

qreal PolarCoordinatePlane::zoomFactorY() const
{
    return d->coordinateTransformations.isEmpty()
        ? 1.0
        : d->coordinateTransformations.first().zoom.yFactor;
}

void PolarCoordinatePlane::setZoomFactors( qreal factorX, qreal factorY )
{
    setZoomFactorX( factorX );
    setZoomFactorY( factorY );
}

void PolarCoordinatePlane::setZoomFactorX( qreal factor )
{
    for ( CoordinateTransformationList::iterator it = d->coordinateTransformations.begin();
                                                it != d->coordinateTransformations.end();
                                                ++it )
    {
        CoordinateTransformation& trans = *it;
        trans.zoom.xFactor = factor;
    }
}

void PolarCoordinatePlane::setZoomFactorY( qreal factor )
{
    for ( CoordinateTransformationList::iterator it = d->coordinateTransformations.begin();
                                                it != d->coordinateTransformations.end();
                                                ++it )
    {
        CoordinateTransformation& trans = *it;
        trans.zoom.yFactor = factor;
    }
}

QPointF PolarCoordinatePlane::zoomCenter() const
{
    return d->coordinateTransformations.isEmpty()
        ? QPointF( 0.5, 0.5 )
        : QPointF( d->coordinateTransformations.first().zoom.xCenter, d->coordinateTransformations.first().zoom.yCenter );
}

void PolarCoordinatePlane::setZoomCenter( const QPointF& center )
{
    for ( CoordinateTransformationList::iterator it = d->coordinateTransformations.begin();
                                                it != d->coordinateTransformations.end();
                                                ++it )
    {
        CoordinateTransformation& trans = *it;
        trans.zoom.xCenter = center.x();
        trans.zoom.yCenter = center.y();
    }
}

DataDimensionsList PolarCoordinatePlane::getDataDimensionsList() const
{
    DataDimensionsList l;

    //FIXME(khz): do the real calculation

    return l;
}

void KChart::PolarCoordinatePlane::setGridAttributes(
    bool circular,
    const GridAttributes& a )
{
    if ( circular )
        d->gridAttributesCircular = a;
    else
        d->gridAttributesSagittal = a;
    setHasOwnGridAttributes( circular, true );
    update();
    Q_EMIT propertiesChanged();
}

void KChart::PolarCoordinatePlane::resetGridAttributes(
    bool circular )
{
    setHasOwnGridAttributes( circular, false );
    update();
}

const GridAttributes KChart::PolarCoordinatePlane::gridAttributes(
    bool circular ) const
{
    if ( hasOwnGridAttributes( circular ) ) {
        if ( circular )
            return d->gridAttributesCircular;
        else
            return d->gridAttributesSagittal;
    } else {
        return globalGridAttributes();
    }
}

QRectF KChart::PolarCoordinatePlane::Private::contentsRect( const KChart::PolarCoordinatePlane* plane )
{
    QRectF contentsRect;
    QPointF referencePointAtTop = plane->translate( QPointF( 1, 0 ) );
    QPointF temp = plane->translate( QPointF( 0, 0 ) ) - referencePointAtTop;
    const qreal offset = temp.y();
    referencePointAtTop.setX( referencePointAtTop.x() - offset );
    contentsRect.setTopLeft( referencePointAtTop );
    contentsRect.setBottomRight( referencePointAtTop + QPointF( 2.0 * offset, 2.0 * offset) );
    return contentsRect;
}

void KChart::PolarCoordinatePlane::setHasOwnGridAttributes(
    bool circular, bool on )
{
    if ( circular )
        d->hasOwnGridAttributesCircular = on;
    else
        d->hasOwnGridAttributesSagittal = on;
    Q_EMIT propertiesChanged();
}

bool KChart::PolarCoordinatePlane::hasOwnGridAttributes(
    bool circular ) const
{
    return
        ( circular )
        ? d->hasOwnGridAttributesCircular
        : d->hasOwnGridAttributesSagittal;
}
